I wrote a script that will upvote all postings containing a salary range:

https://gist.github.com/dlo/77426445e6403da12c652ac00b86764f

I've tried to make it comprehensive, and it supports a few different formats, but if it doesn't catch something it should (or it upvotes something it shouldn't), let me know. It throttles to 1 vote every 2s as to be nice to the HN servers. Hope this is helpful!